This motor with small size and less weight, low power. It can output enough force to make some model like mini aircraft and robot platform. 　 Specification： Diameter: 8mm Length: 27mm Shaft length: 6.0mm Shaft diameter: 1mm Nominal Voltage: 4.7V Pperating Voltage: 2.0-5.5V No Load Speed: 19900 r/min No Load Current: 0.11A At Maximum Efficiency of Torque: 0.14mN.m（1.4g.cm） At Maximum Efficiency of Output: 0.23W Stall Torque: 0.7mN.m(7.1g.cm) Stall Current: 0.42A For any technical support or suggestion, please kindly go to our forum.